Improvement in balanced slide-valves



E. H EYDE Balanced Slide-Valves.

' Patented Feb. 3. 1874.

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UNITED STATES PATENT OFFICE.

EDlVARl) l-IEYDE, OF EAST SAG'IXA\V, MIOHIGAI".

IMPROVEMENT IN BALANCED SLIDE-VALVES.

Specification forming part of Letters Patent No. 147,1.31, datei February 3, 1874; application filed July 11, 1873.

To all whom it may concern:

Be it known that I, EDWARD llnvnn, of East Saginaw, in the county of Saginaw and State of Michigan, have invented anew and useful Improvement in Balanced Slide-Valves; and I do declare that the following is a true and accurate description thereof, reference being had to the accompanying drawings and to the letters of reference marked thereomand 'being a part of this specification, in which Figure 1 is a longitudinal vertical section through a steam-chest fitted to my improved balance-valve on sex in I i g. 2. Fig. 2 is a plan of the chest and valve, the steam-chest cover being removed and the sleeve of the valve being shown in cross-section. Fi I; is a perspective view of the valve. Fig. is a de taehed perspective view of the sleeve, which is titted to the piston of the valve.

Like letters refer to like parts in the several figures.

The nature of this invention relates to an improvement in that class of slide-vales in which the pressure of the steam is taken off a portion of the area of the back of the valve; and it consists in constructing the valve with a ring on its back, which is inclosed by a flanged piston or sleeve working steam-tight under the cover of the steam-chest, being kept in contact therewith by leaf-sprin gs interposed between the top of the ring and the flange of the sleeve. An aperture is made through the back of the valve communieatin g with the exhaust-port, forming a vacuum in the ringchamber, as more fully hereinafter set forth.

In the drawing, A represents the upper portion of the cylinder of a steam-en gine, in which a a are the steam-ports and I) the exhaust-port.

13 is the steam-chest fitted with a cover, B. C is the slide-valve, and c is its exhaust-port. d is a cylinder, open at the top, closed at the bottom, cast with the valve, to whose back it is connected with a transverse rib, (1, through which is drilled an aperture, c, communicatin with the exhaust port. 1" is an internallyflanged sleeve, fitted accurately, but easily on the cylinder (1, a packing-ring, g, being inserted in a groove in the latter to cause the sleeve to work steam-tight thereon. The under side of the steam-chest cover should be planed true, as well as the upper surface of the sleeve-flange,s0 that the latter may work steamtight against the former, it being kept in contact therewith by several leaf springs h interposed betwcen the top of the cylinder and the flange of the sleeve. Thearea included in the cylinder d is relieved of steanrpressure, and by connecting the chamber with the exhaust apartial vacuum is formed therein, which tends to lift the valve from the seat. In condensing engines, this vacuum will be still more perfect.

By making the area of the cylinder (I nearly equal to that of the exposed back of the valve, the latter-will be practically balanced.

\Yhat I claim as my invention, and desire to secure by Letters Patent, is-

The slidevalve 0 cast with the cylinder (1 onits back, with the aperture 0 connecting it with the exhaust-port, the flanged sleeve f and springs h, constructed, arranged, and operat ing substantially as and for the purposes set forth.

El) WARD IIEYDE.

\Vitnesses:

(lino. A. FLAxnnns, ll. 13. 'Il'AnILTox. 

